/*
 * Copyright 2012 LinkedIn Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package azkaban.execapp;


import org.apache.commons.io.IOUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.*;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.HttpClientUtils;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.TrustStrategy;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.util.EntityUtils;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.nio.charset.Charset;
import java.security.GeneralSecurityException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.*;

/**
 * HTTP 请求工具类
 *
 * @Author duhan
 * @Version V1.0.0
 * @Date 2019/8/16 17:13
 */
public class HttpUtils {
    private static final Log logger = LogFactory.getLog(HttpUtils.class);
    private static final String DATA = "data";
    private static final String ROWS = "rows";
    private static final String DICTKEY = "dictKey";
    private static Set<String> params = null;
    private static PoolingHttpClientConnectionManager connMgr;
    private static RequestConfig requestConfig;
    private static final int MAX_TIMEOUT = 60000;

    private HttpUtils() {
    }

    static {
        // 设置连接池
        connMgr = new PoolingHttpClientConnectionManager();
        // 设置连接池大小
        connMgr.setMaxTotal(100);

        connMgr.setDefaultMaxPerRoute(connMgr.getMaxTotal());

        RequestConfig.Builder configBuilder = RequestConfig.custom();
        // 设置连接超时
        configBuilder.setConnectTimeout(MAX_TIMEOUT);
        // 设置读取超时
        configBuilder.setSocketTimeout(MAX_TIMEOUT);
        // 设置从连接池获取连接实例的超时
        configBuilder.setConnectionRequestTimeout(MAX_TIMEOUT);

        requestConfig = configBuilder.build();

    }

    public static String doGet(String url) {
        return doGet(url, null, null);
    }

    public static String doGet(String url, Map<String, Object> map) {
        return doGet(url, map, null);
    }

    public static String doGet(String url, Header... headers) {
        return doGet(url, null, headers);
    }

    /**
     * 发送 GET 请求（HTTP），K-V形式
     *
     * @param url
     * @param params
     * @return
     */
    public static String doGet(String url, Map<String, Object> params,
                               Header[] headers) {
        long start = System.currentTimeMillis();
        String apiUrl = url;
        StringBuffer param = new StringBuffer();
        if (params != null) {
            int i = 0;
            for (String key : params.keySet()) {
                if (i == 0) {
                    param.append("?");
                } else {
                    param.append("&");
                }
                try {
                    param.append(key)
                            .append("=")
                            .append(URLEncoder.encode(params.get(key)
                                    .toString(), "utf-8"));
                } catch (UnsupportedEncodingException e) {
                    logger.error(e);
                }
                i++;
            }
        }
        apiUrl += param;
        String result = null;
        int statusCode = 0;
        CloseableHttpClient httpclient = HttpClients.custom()
                .setDefaultRequestConfig(requestConfig).build();
        try {
            HttpGet httpGet = new HttpGet(apiUrl);
            if (headers != null && headers.length > 0) {
                for (Header header : headers) {
                    httpGet.addHeader(header);
                }
            }
            HttpResponse response = httpclient.execute(httpGet);
            statusCode = response.getStatusLine().getStatusCode();

            HttpEntity entity = response.getEntity();
            if (entity != null) {
                InputStream instream = entity.getContent();
                result = IOUtils.toString(instream, "UTF-8");
            }
        } catch (IOException e) {
            logger.error(e);
        } finally {
            if (httpclient != null) {
                HttpClientUtils.closeQuietly(httpclient);
            }
        }
        logger.info(String.format(
                "request to:%s,param:%s,response code:%s,cost %s ms",
                apiUrl, param.toString(), statusCode,
                (System.currentTimeMillis() - start)));
        return result;
    }

    /**
     * 发送 POST 请求（HTTP），不带输入数据
     *
     * @param apiUrl
     * @return
     */
    public static String doPost(String apiUrl) {
        return doPost(apiUrl, new HashMap<String, Object>());
    }

    /**
     * 发送 POST 请求（HTTP），K-V形式
     *
     * @param apiUrl
     *            API接口URL
     * @param params
     *            参数map
     * @return
     */
    public static String doPost(String apiUrl, Map<String, Object> params) {
        long start = System.currentTimeMillis();
        CloseableHttpClient httpClient = HttpClients.custom()
                .setDefaultRequestConfig(requestConfig).build();
        String result = null;
        HttpPost httpPost = new HttpPost(apiUrl);
        httpPost.addHeader("Content-Type", "application/json; charset=utf-8");
        CloseableHttpResponse response = null;
        int statusCode = 0;
        try {
            httpPost.setConfig(requestConfig);
            List<NameValuePair> pairList = new ArrayList<NameValuePair>();
            logger.info("apiUrl:" + apiUrl);
            for (Map.Entry<String, Object> entry : params.entrySet()) {
                NameValuePair pair = new BasicNameValuePair(entry.getKey(),
                        entry.getValue() == null ? "" : entry.getValue()
                                .toString());
                pairList.add(pair);
                logger.info(entry.getKey() + "：" + entry.getValue());
            }
            httpPost.setEntity(new UrlEncodedFormEntity(pairList, Charset.forName("UTF-8")));

            logger.info("POST success1");
            response = httpClient.execute(httpPost);
            logger.info("POST success2");
            statusCode = response.getStatusLine().getStatusCode();
            if (statusCode != 200) {
                logger.error(String.format("返回状态码：%s,返回结果：%s", statusCode,
                        response));
                return "";
            }
            HttpEntity entity = response.getEntity();
            result = EntityUtils.toString(entity, "UTF-8");
            httpClient.close();
        } catch (IOException e) {
            logger.error("errmsg : ", e);
        } finally {
            if (response != null) {
                try {
                    EntityUtils.consume(response.getEntity());
                } catch (IOException e) {
                    logger.error(e);
                }
            }
        }

        logger.info(String.format(
                "request to:%s,response code:%s,cost %s ms",
                apiUrl, statusCode,
                (System.currentTimeMillis() - start)));
        return result;
    }

    /**
     * 发送 POST 请求（HTTP），string形式
     *
     * @param apiUrl
     * @param data
     *            json对象
     * @return
     */
    public static String doPost(String apiUrl, String data) {
        long start = System.currentTimeMillis();
        CloseableHttpClient httpClient = HttpClients.custom()
                .setConnectionManager(connMgr)
                .setDefaultRequestConfig(requestConfig).build();
        String result = null;
        HttpPost httpPost = new HttpPost(apiUrl);
        httpPost.addHeader("Content-Type", "application/json; charset=utf-8");
        CloseableHttpResponse response = null;
        int statusCode = 0;
        try {
            httpPost.setConfig(requestConfig);
            StringEntity stringEntity = new StringEntity(data.toString(),
                    "UTF-8");// 解决中文乱码问题
            stringEntity.setContentEncoding("UTF-8");
            httpPost.setEntity(stringEntity);
            response = httpClient.execute(httpPost);
            HttpEntity entity = response.getEntity();
            statusCode = response.getStatusLine().getStatusCode();
            result = EntityUtils.toString(entity, "UTF-8");
        } catch (IOException e) {
            logger.error(e);
        } finally {
            httpPost.abort();
            if (response != null) {
                try {
                    EntityUtils.consume(response.getEntity());
                } catch (IOException e) {
                    logger.error(e);
                }
            }
        }
        logger.info(String.format(
                "request to:%s,param:%s,response code:%s,cost %s ms",
                apiUrl, data, statusCode,
                (System.currentTimeMillis() - start)));
        return result;
    }

    /**
     * 发送 SSL POST 请求（HTTPS），K-V形式
     *
     * @param apiUrl
     *            API接口URL
     * @param params
     *            参数map
     * @return
     * @throws Exception
     */
    public static String doPostSSL(String apiUrl, Map<String, Object> params)
            throws Exception {
        long start = System.currentTimeMillis();
        CloseableHttpClient httpClient = HttpClients.custom()
                .setSSLSocketFactory(createSSLConnSocketFactory())
                .setConnectionManager(connMgr)
                .setDefaultRequestConfig(requestConfig).build();
        HttpPost httpPost = new HttpPost(apiUrl);
        httpPost.addHeader("Content-Type", "application/json; charset=utf-8");
        CloseableHttpResponse response = null;
        String result = null;
        int statusCode = 0;
        try {
            httpPost.setConfig(requestConfig);
            List<NameValuePair> pairList = new ArrayList<NameValuePair>(
                    params.size());
            for (Map.Entry<String, Object> entry : params.entrySet()) {
                NameValuePair pair = new BasicNameValuePair(entry.getKey(),
                        entry.getValue().toString());
                pairList.add(pair);
            }
            httpPost.setEntity(new UrlEncodedFormEntity(pairList, Charset
                    .forName("utf-8")));
            response = httpClient.execute(httpPost);
            statusCode = response.getStatusLine().getStatusCode();
            if (statusCode != HttpStatus.SC_OK) {
                return null;
            }
            HttpEntity entity = response.getEntity();
            if (entity == null) {
                return null;
            }
            result = EntityUtils.toString(entity, "utf-8");
        } catch (Exception e) {
            logger.error("doPostSSL:", e);
            throw new Exception("请求失败");
        } finally {
            if (response != null) {
                try {
                    EntityUtils.consume(response.getEntity());
                } catch (IOException e) {
                    logger.error("doPostSSL:", e);
                }
            }
        }
        logger.info(String.format(
                "request to:%s,param:%s,response code:%s,rcost %s ms",
                apiUrl, params.toString(), statusCode,
                (System.currentTimeMillis() - start)));
        return result;
    }

    /**
     * 发送 SSL POST 请求（HTTPS），JSON形式
     *
     * @param apiUrl
     *            API接口URL
     * @param json
     *            JSON对象
     * @return
     * @throws Exception
     */
    public static String doPostSSL(String apiUrl, String json) throws Exception {
        CloseableHttpClient httpClient = HttpClients.custom()
                .setSSLSocketFactory(createSSLConnSocketFactory())
                .setConnectionManager(connMgr)
                .setDefaultRequestConfig(requestConfig).build();
        HttpPost httpPost = new HttpPost(apiUrl);
        httpPost.addHeader("Content-Type", "application/json; charset=utf-8");
        CloseableHttpResponse response = null;
        String httpStr = null;

        try {
            httpPost.setConfig(requestConfig);
            StringEntity stringEntity = new StringEntity(json.toString(),
                    "UTF-8");// 解决中文乱码问题
            stringEntity.setContentEncoding("UTF-8");
            stringEntity.setContentType("application/json");
            httpPost.setEntity(stringEntity);
            response = httpClient.execute(httpPost);
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode != HttpStatus.SC_OK) {
                logger.error("doPostSSL:" + statusCode + "  "
                        + response.getStatusLine().getReasonPhrase());
                return null;
            }
            HttpEntity entity = response.getEntity();
            if (entity == null) {
                return null;
            }
            httpStr = EntityUtils.toString(entity, "utf-8");
        } catch (Exception e) {


            throw e;
        } finally {
            if (response != null) {
                try {
                    EntityUtils.consume(response.getEntity());
                } catch (IOException e) {
                    logger.error("doPostSSL:", e);
                }
            }
        }
        return httpStr;
    }

    /**
     * 创建SSL安全连接
     *
     * @return
     */
    private static SSLConnectionSocketFactory createSSLConnSocketFactory() {
        SSLConnectionSocketFactory sslsf = null;
        try {
            SSLContext sslContext = new SSLContextBuilder().loadTrustMaterial(
                    null, new TrustStrategy() {

                        @Override
                        public boolean isTrusted(X509Certificate[] chain,
                                                 String authType) throws CertificateException {
                            return true;
                        }
                    }).build();
            sslsf = new SSLConnectionSocketFactory(sslContext,
                    new HostnameVerifier() {

                        @Override
                        public boolean verify(String hostname,
                                              SSLSession session) {
                            return false;
                        }

                    });
        } catch (GeneralSecurityException e) {
            logger.error(e);
        }
        return sslsf;
    }
}
